Deposición y circulación de corrientes de fondo del Oligoceno al Mioceno frente al margen oriental de la Tierra de Wilkes, Antártida Oriental.

  1. Ariadna Salabarnada 1
  2. Carlota Escutia 1
  3. Dimitris Evangelinos 1
  4. Adrián López-Quirós 1
  5. Marga García 2
  6. Hans C. Nelson 1
  1. 1 Instituto Andaluz de ciencias de la Tierra (IACT, CSIC-UGR)
  2. 2 Instituto Español de Oceanografía
    info

    Instituto Español de Oceanografía

    Madrid, España

    ROR https://ror.org/00f3x4340

Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2021

Issue Title: X Congreso Geológico de España

Issue: 18

Pages: 1133

Type: Article

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More publications in: Geotemas (Madrid)

Abstract

Sediment cores collected from the Antarctic Wilkes Land continental rise at IODP Site U1356 provide evidence for bottom current sedimentation since the early Oligocene (i.e. 33.6 Ma). Correlation between Site U1356 sediments and the regional grid of multichannel seismic reflection profiles reveal three paleoceanographic phases in bottom current evolution: 1) Early Oligocene (33.6-28 Ma), when sheeted drift morphologies dominate, associated to westward flowing currents occurring under the influence of proto-Antarctic Bottom Water (AABW); 2) At around 28 Ma, an intensification of contour currents results in higher relief contourite morphologies that point to two water masses occupying the seafloor with opposite flow directions: A westward flowing proto-AABW and an eastward flowing contour current, interpreted as proto-Circumpolar Deep Water (CDW). 3) Middle Miocene (>17 Ma), when the proto-AABW is confined to the area to the south of the structural highs in the basin while proto-CDW, expands spatially and forms a more complex contouritic system.

Data source: Dialnet